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Looking for this math tool

I’m looking for this math tool. The purpose behind getting this will be a part of my high school trig lesson showing how I can find the height of an object using trig. I would love a large protractor like object like this but don’t even know what this one is called to search for one on amazon or eBay. Any suggestion is appreciated.

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To see it in use go to 11:45 here:

 

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